feat: Add servicex client

[matthewfeickert]

• c.f. https://github.com/ssl-hep/ServiceX_frontend
• Recipe generated with grayskull via 'grayskull pypi servicex' and then edited to add additional information.

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• License file is packaged (see here for an example).
• Source is from official source.
• Package does not vendor other packages. (If a package uses the source of another package, they should be separate packages or the licenses of all packages need to be packaged).
• [N/A] If static libraries are linked in, the license of the static library is packaged.
• Package does not ship static libraries. If static libraries are needed, follow CFEP-18.
• Build number is 0.
• A tarball (url) rather than a repo (e.g. git_url) is used in your recipe (see here for more details).
• GitHub users listed in the maintainer section have posted a comment confirming they are willing to be listed there.
• When in trouble, please check our knowledge base documentation before pinging a team.

[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/servicex/meta.yaml) and found some lint.

Here's what I've got...

For recipes/servicex/meta.yaml:

• Non noarch packages should have python requirement without any version constraints.
• Non noarch packages should have python requirement without any version constraints.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/servicex/meta.yaml) and found it was in an excellent condition.

[matthewfeickert]

conda-forge/func-adl-feedstock#9 should fix the current errors.

[matthewfeickert]

@conda-forge-admin, please restart ci

[matthewfeickert]

(Having to force push as the CI lost the branch on restart through the bot)

[matthewfeickert]

This is a noarch package in reality, but I believe that to use to use selectors like # [py<310] you can't use them with noarch. This is what grayskull generated too.

[ocefpaf]

Just remove the selectors, installing those packages in py>39/py310 is not a problem.

[matthewfeickert]

@conda-forge/help-python, ready for review!

[ocefpaf]

Nice to keep the comments! Reminder to remove when we bump the min Python.

[matthewfeickert]

Thanks for the help and fast merge @ocefpaf!